Mathematics
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    0.9×(1.0×1.0×16.7+2×1.0×0.16×1.0×360)×4.1×10^5
    (4×201.06×250+17×201.06×1300)/(1350×300×70)
    2.55cos20
    3.75cos20
    180-90+arctan(-1.355)-arctan2.71
    180-90+arctan2.5-arctan5=
    (2.74-1)/(1+1.7)
    ( 1320.8+800+2590.5)/ (3982.38)
    2×150×3.14×2.5×1.1
    50.03×7.96×1×10
    50.03×0.8×2.4×10
    (1413+0)/(1149.12+907.92+800)
    1.8×4.85×4×2.6×10
    2×150×3.14×2.5×0.6
    59.85×0.8×2.4×10
    ( 840.50+800+1648.5)/ (3782.26)
    2×150×3.14×2.5×0.7
    50.03×7.56×1×10
    50.03×0.7×2.4×10
    =59.85-π×(2.5/2)^2*2

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